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What should be the resistances of the rheostat sections R1, R2 and R3 (Fig.) for the current flowing through an instrument with a resistance R0 of 30Ωto change by 1 A as the rheostat arm is moved from contact to contact? The circuit is connected to a voltage source of 120 V. 

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Answer: R1 = 10 ohms, R2 = 20 ohms, R3 = 60 ohms.

Explanation:

When the rheostat is connected, the current will be I0 = V/R0 = A A. The resistance R1 is determined from the equation

  

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